<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        const obj = {
            name: '张三',
            age: 18,
            gender: '男',

            getHello: function(){
                console.log(hello);
            }
        }
        // obj.prototype.sayHello = function(){
        //     console.log('hello1111');
        // };
        
        console.log(obj.hasOwnProperty('name'));
        console.log(obj);
    </script>
</body>
</html>